Section 6-6-9-7 - Imposition of tax; amount(a) An excise tax, known as the auto rental excise tax, is imposed upon the rental of passenger motor vehicles and trucks in Indiana for periods of less than thirty (30) days.(b) The auto rental excise tax imposed upon the rental of a passenger motor vehicle or truck equals four percent (4%) of the gross retail income received by the retail merchant for the rental.As added by P.L. 19-1986, SEC.18.